667538190349 has 2 divisors, whose sum is σ = 667538190350. Its totient is φ = 667538190348.

The previous prime is 667538190301. The next prime is 667538190377. The reversal of 667538190349 is 943091835766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514242449449 + 153295740900 = 717107^2 + 391530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667538190349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667538196349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333769095174 + 333769095175.

It is an arithmetic number, because the mean of its divisors is an integer number (333769095175).

Almost surely, 2^667538190349 is an apocalyptic number.

It is an amenable number.

667538190349 is a deficient number, since it is larger than the sum of its proper divisors (1).

667538190349 is an equidigital number, since it uses as much as digits as its factorization.

667538190349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 667538190349 in words is "six hundred sixty-seven billion, five hundred thirty-eight million, one hundred ninety thousand, three hundred forty-nine".